| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] [v-ing] [prep] three [noun pl] | 10 |
|
| 2 | has [been] [v-ing] [prep] three [noun] | 10 |
|
| 3 | has [been] [v-ing] [prep] three years | 7 |
|
| 4 | has [been] [v-ing] [prep] three year | 7 |
|
